Planooraph co



i '1; F. WIBEBACK. POSITIVE 0R MASTER CAST FOR THE REPROQUCTION 0F N EGATIVEOR SOCKETED ARTIFICIAL LIMBS.

- APPLICATION FILED IAN. n. 1918.

Patnted Jug 22,1919.

m hrmmmb THE COLUMBIA PLANOORAPI! 1:0 WASHINGTON. I). c.

UNITED sT 'rns PATENT onnron.

JOSEPH F. WIREBACK, or PITTSBURGH, PENNSYLVANIA.

rosrrrvn on MASTER oAsr non 'rnnnnrnonuc'rron or NEGATIVE on sooKnrnn ARTIFICIAL nIMBs.

Specification of Lettersratent. Patented July 22, 1919.

Application filed Januar 7, 19 18. Serial No. 212,172

To all whom it may concern:

Be it known that I, J osnrn F. WIREBAoK, a citizen of the United States, residing at Pittsburgh, in the county of Allegheny and State of Pennsylvania, have invented new and useful Improvements in Positive or Master Casts for the Reproduction of NegativebrSocketed Artificial Limbs, of which the following is a specification. This invention relates to certain new and useful improvements in a'positive or master castwhich is used in connection with a lathe for the re roduction of a negative or socketed arti cial limb, also the method of The main object of this invention is the production of a cast pattern, which during its formation is properly centered upon a support or shaft by which the pattern can be accurately secured in posi tion in the lathe without further adjustment,

Another object ofthe presentinvention, is the production of a cast patternwhich not only causes the formation of a socket in exact accordance with thestump but also guides the cutting tool in hollowing out-the lower part of the artificial limb.

Other objects and aims of theinvention, more or less broad than those stated together with the advantages inherent, will be in part obvious and in part specifically referred to in the course of the following description, and the scope of the protection contemplated will appear from the claims.

In the accompanying drawings, which are to be taken as a part of the specification,

and in which I have shown a merely preferred form of the embodiment of the invention, Fig. 1 is a view of a'leg stump with the mold of the same applied, Fig. 2 is a view of the mold with th closed end portion removed, Fig. 3 is a sectional view illustrating the manner of assembling the parts and filling to produce the positive pattern, Fig. 4 is a side elevation of the cast after the removal of themold and Fig. 5 shows a view of the finished cast after the plastic material used in filling the extension 4 has been cut away to the desired shape. 7

Referring more in detail to the drawings, wherein similar letters of reference indicate like parts throughout the several views, 1 indicates the stump of a human limb, u on there is cast a portion 2 preferably formed byfirst placing a so called stocking over the stump, then wrapping thereabout a plurality of layers of plasterized gauze bandage. This is allowed to remain until set and is then removed from the stump. The closed end 3 of this portion 2 is then removed. So far described only a mold of the actual stump is produced and in order that the final production of theartificial limb may be hollowed out below its socketed portion, in the usual way, to produce a limb of extreme lightness, the following construction is added to the casting 2. An extension 4, which maybe made; of paper, card board or any suitable material, is fitted about the stump casting adjacent its end 5. This extension'is hollow and preferably of a gradual tapering formation from end to end.

The mold with its extension is then centered-over a shafting or arbor 6 andtemporarily secured in position by being fas tened to the block 7 into which one end of the shaft 6 extends. Plastic material 8 of any desirable substance. is then poured within the mold and extension 4, completely fill After the plastic mass has set, the mold and extension is cut away from the same and the block is slid from the end of the shaft, thereby leaving a positive cast pattern properly centered upon the shaft.

When the pattern is completed it will be noted that there is an offset 10 at the point of junction of the tapering portion 4 and the socket forming portion 2 which being in this positive pattern will result in an enlargement of the hollowed out portion of the resultant limb immediately below the socket The ofi'set is smoothed down with a rasp just enough to allow ample room at the end of the socket for the reception of the tender portion of the stump and prevent constant arring incident to walking, from continually pulling the side portions of the stump backward, which will ultimately result in an exposure of the bone. The remainder of the extension is then shaped down to the proper tapered size required. This pattern, when inserted into a turnlathe east. as is commonly known in the end (if/said mold, securing an extension to art will guide the tracing member, which in turn controls the movement of the Giftting tool, and therefore accuratel roduce the soeket for the human stump and then continue to preclude the'h'ol-lowed out artion of the artificial limb below thesoeke't.

It is intended that all matter containedin the above description or shownin the ac 'companying drawings shall be interpreted as lllustratlve and not in a limiting sense.

It is also to be understood that the language' riser in the following claims is intended to cover all the generic and specific; formation of the invention herein described and all statements of the scope of the invention, which as a matter of angua 'e, might be said to fall therebetween.

1. Themethod or forming a positive turn in}; pattern for the reproduction of a socketed artificial limb which consists in talking a mold of the stump centerin said mold aboiit a shaft, then filling the mold with a plastic substance embedding the shaft therein, then eiitting the said mold from about the set plastic sutsta ee'. I

2. The method of forming'a positive turn in}; pattern for the reproduction of a'so'o'keted artificial limb which consists in takinga mold of the stump then removing. the closed the mold then centering said mold and eke tension about a shaft, filling said mold and extension with a plastic substance embedtidbits of this fiatrlt may li obtained for din'g' the" shaft therein, then cutting said 'ii'iold and extension from about the set plastie slibstanee. Y

3. In a positive limb patternfor the productionof asoeketed artificial lihi'b comsooli'et'ed artificial 11 mb cont.

throfigh the longitudinal centers orsaid portions. r

6. In positive limb patt rn rerthe production of a soketed artificial limb coin prising an integral-1y cast socket forming portion and a lower limb borihg phit'ion, an offset adjacent the" junction of the socket and limb boring ardons to provide ah enlargement at 'a correspondiiifilplae "the negative form: i

In testimoriy whereof I aflix" in'y' sigm titre in the presenee of two witnesses.

JUSEPH F. WIREBKGK.

Witnessesi P. Ho'wARdf Graeme w; Don'ia. 

